This file is indexed.

/usr/lib/R/site-library/Cairo/INDEX is in r-cran-cairo 1.5-9-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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Cairo                   Create a new Cairo-based graphics device
Cairo.capabilities      Reports which output types are supported by
                        this Cairo build
Cairo.capture           Capture contents of an image backend or a
                        display list snapshot.
Cairo.onSave            Cairo callbacks
Cairo.serial            Check for changes in the graphics state of
                        Cairo devices.
CairoFontMatch          Find installed fonts with a fontconfig pattern
CairoFonts              Set the fonts used for all Cairo graphics
                        devices.